A small pyrotechnic device (firework) sized and shaped like a AA battery. Once ignited, it begins to emit sparks and a colored flame from a hole in its side. The rapid exiting of combustion gasses causes the firework to spin rapidly on the ground (hence the name) while the flame changes colors. This firework is very good at setting anything it gets near ablaze and should never be used near anything flammable. While it is called a ground bloom, it will also spin briefly in the air if thrown or mechanically launched after the fuse has been lit. Commonly sold in blister packs in fireworks tents.